Solutions :

3-letter words (1 point): 67

AIA; AIM; AIT; AMI; AMP; ANE; ANT; APE; APO; APT; ATE; CEE; CEP; DAE; DAM; DAP; DEE; EAN; EAT; EON; ETA; IMP; ITA; JOE; JOT; MAD; MAE; MAP; NAE; NAP; NAT; NET; NON; NOT; ONE; OPE; OPT; PAD; PAM; PAN; PAT; PEA; PEC; PED; PEE; PET; PIA; PIT; POT; POZ; TAE; TAI; TAN; TAP; TEA; TEC; TED; TEE; TEN; TIP; TOE; TON; TOP; ZEA; ZED; ZEE; ZEP.

4-letter words (1 point): 57

AEON; AMIA; ANON; ANTE; ANTI; APED; ATOP; CEDE; CETE; DAMP; DEEP; DEET; ETEN; ETNA; JOTA; MADE; MITE; NAPA; NAPE; NEAP; NEAT; NETE; NONA; NONE; NOPE; NOTA; NOTE; OPED; PANE; PANT; PATE; PEED; PEON; PIAN; PIMA; PITA; POET; PONE; PONT; POTE; TANE; TAPA; TAPE; TEAD; TEAM; TEED; TEPA; TOEA; TOED; TONE; TOPE; TOPI; TOZE; ZETA; ZOEA; ZONA; ZONE.

5-letter words (2 points): 33

ADEPT; AMPED; ANTED; APIAN; APTED; ATONE; DEPOT; ENATE; ENTIA; ETAPE; IMPED; IMPOT; NAIAD; NAPED; NETOP; NONET; NOTED; OPTED; PAEON; PANTO; PATED; PATEN; PIANO; PITON; POTAE; POTED; TAPED; TEADE; TENON; TOPED; TOPEE; TOZED; ZONAE.

6-letter words (3 points): 13

ANOPIA; ANTEED; CETANE; DEPONE; IMPEDE; IMPONE; NEAPED; OPIATE; OPTIMA; PANTED; PANTON; TEOPAN; ZONATE.

7-letter words (7 points): 4

NOTEPAD; OPIATED; TIMPANO; ZONATED.